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3D asymmetrical kinematics of mono-age populations from LAMOST and Gaia common red clump stars

Published online by Cambridge University Press:  14 May 2020

H.-F. Wang
Affiliation:
South–Western Institute for Astronomy Research, Yunnan University, Kunming, 650500, P. R. China email: hfwang@bao.ac.cn Department of Astronomy, China West Normal University, Nanchong637009, China LAMOST Fellow
Martn López-Corredoira
Affiliation:
Instituto de Astrof sica de Canarias, E-38205 La Laguna, Tenerife, Spain
Y. Huang
Affiliation:
South–Western Institute for Astronomy Research, Yunnan University, Kunming, 650500, P. R. China email: hfwang@bao.ac.cn
Jeffrey L. Carlin
Affiliation:
LSST, 950 North Cherry Avenue, Tucson, AZ85719, USA

Abstract

With the LAMOST DR4 and Gaia DR2 common red clump giant stars, we investigate the three-dimensional kinematics of Milky Way disk stars in mono-age populations between Galactocentric distances of R = 6 and 15 kpc. We confirm the 3D asymmetrical motions of recent works, and provide time tagging of the Galactic outer disk asymmetrical motions. Radial motions present a north-south asymmetry in the region corresponding to recent density and velocity substructures that were sensitive to the perturbations in the early 6 Gyr. What’s more, we discover a new velocity substructure in the north side corresponding to density dip found recently (“south-middle opposite”) in the radial and azimuthal velocity. Meanwhile, the vertical velocity with clear vertical bulk motions or bending mode motions has no clear asymmetry corresponding to the in-plane asymmetrical features.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

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References

Antoja, T., Helmi, A., Romero-Gomez, M., et al. 2018, arXiv:1804.10196. (A18)Google Scholar
Wang, H. F. Carlin, J. L., Huang, Y.et al. 2019, ApJ, 884, 135CrossRefGoogle Scholar
Wang, H. F., López-Corredoira, M., Huang, Y.et al. 2020, MNRAS, 491, 2104Google Scholar
Widrow, L. M., Gardner, S., Yanny, B., Dodelson, S., & Chen, H.-Y. 2012, ApJ, 750, L41CrossRefGoogle Scholar

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